gst-trick-mode-looping-1.py

   1 #!/usr/bin/env python
   2
   3 # Get a test sample with:
   4 # youtube-dl -t http://www.youtube.com/watch?v=yWa-YXiSk2Y
   5
   6 import sys
   7
   8 import gobject
   9 gobject.threads_init()
  10
  11 import gst
  12
  13
  14 class Player:
  15     def __init__(self, filename, rate):
  16         self._filename = filename
  17         self._rate = rate
  18
  19         self._player = gst.element_factory_make("playbin2", "player")
  20         self._player.set_property("uri", filename)
  21
  22         bus = self._player.get_bus()
  23         bus.add_signal_watch()
  24         bus.connect('message::eos', self.on_eos)
  25         bus.connect('message::state-changed', self.on_state_changed)
  26
  27     def run(self):
  28         self._player.set_state(gst.STATE_PLAYING)
  29         loop = gobject.MainLoop()
  30         loop.run()
  31
  32     def on_eos(self, bus, msg):
  33         sys.stderr.write(".")
  34         self._player.set_state(gst.STATE_PLAYING)
  35         seek_event = gst.event_new_seek(self._rate,
  36                 gst.FORMAT_TIME,
  37                 gst.SEEK_FLAG_FLUSH | gst.SEEK_FLAG_ACCURATE,
  38                 gst.SEEK_TYPE_SET, 0,
  39                 gst.SEEK_TYPE_NONE, 0)
  40         self._player.send_event(seek_event)
  41
  42     def on_state_changed(self, bus, msg):
  43         if msg.src != self._player:
  44             return
  45
  46         print 'on_state_changed'
  47         old_state, new_state, pending = msg.parse_state_changed()
  48         print "%s -> %s" % (old_state, new_state)
  49         if new_state == gst.STATE_PAUSED:
  50             self.set_rate(self._rate)
  51
  52     def set_rate(self, rate):
  53         self._rate = rate
  54         try:
  55             position, format = self._player.query_position(gst.FORMAT_TIME)
  56         except:
  57             position = 0
  58
  59         # Create the seek event
  60         if rate > 0:
  61             seek_event = gst.event_new_seek(rate,
  62                     gst.FORMAT_TIME,
  63                     gst.SEEK_FLAG_FLUSH | gst.SEEK_FLAG_ACCURATE,
  64                     gst.SEEK_TYPE_SET, position,
  65                     gst.SEEK_TYPE_NONE, 0)
  66         else:
  67             seek_event = gst.event_new_seek(rate,
  68                     gst.FORMAT_TIME,
  69                     gst.SEEK_FLAG_FLUSH | gst.SEEK_FLAG_ACCURATE,
  70                     gst.SEEK_TYPE_SET, 0,
  71                     gst.SEEK_TYPE_SET, position)
  72
  73         if seek_event:
  74             self._player.send_event(seek_event)
  75             gst.info("rate set to %s" % rate)
  76         else:
  77             gst.warining("change rate failed")
  78
  79
  80 def main(args):
  81     def usage():
  82         sys.stdout.write("usage: %s <URI-OF-MEDIA-FILE>\n" % args[0])
  83
  84     if len(args) != 2:
  85         usage()
  86         sys.exit(1)
  87
  88     if not gst.uri_is_valid(args[1]):
  89         sys.stderr.write("Error: Invalid URI: %s\n" % args[1])
  90         sys.exit(1)
  91
  92     player = Player(args[1], 3.0)
  93     player.run()
  94
  95 if __name__ == '__main__':
  96     sys.exit(main(sys.argv))